APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Aurora Simionescu (ISAS)
Title: Constraints on the chemical enrichment history in clusters of galaxies from X-ray spectroscopy
Date (JST): Wed, Nov 08, 2017, 15:40 - 16:40
Place: Seminar Room A
Abstract: I will review the most recent measurements of the chemical composition of the X-ray emitting intra-cluster medium, from the immediate vicinity of the brightest cluster galaxy out to the virial radii of nearby clusters, as well as the evolution of the metal content in clusters over cosmic time. Current evidence supports a scenario in which most of the chemical elements in the ICM were produced at early times, and solar abundance ratios are surprisingly common throughout the Universe. The latest high-resolution spectroscopy measurements of the core of the Perseus Cluster provided by the Hitomi satellite further confirm this hypothesis. The Hitomi data also allow us to measure the abundances of multiple Fe-group elements with high accuracy for the first time; I will present the implications of these results for constraining metal production from type Ia supernovae, and discuss the remaining challenges in reproducing the observed chemical abundance pattern using current supernova yield models.